r600/shader: only read back the necessary tess factor components.

This just reduces the lds reads for the the tess factor emission.

Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index e28882b2e5d7fee8ae4891d2134ce3deaf6d7b58..f6ff2055ee33deae9bb430e46e65b87458b4784a 100644 (file)
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -2851,7 +2851,7 @@ static int r600_store_tcs_output(struct r600_shader_ctx *ctx)
 }
 
 static int r600_tess_factor_read(struct r600_shader_ctx *ctx,
-                                int output_idx)
+                                int output_idx, int nc)
 {
        int param;
        unsigned temp_reg = r600_get_temp(ctx);
@@ -2871,7 +2871,7 @@ static int r600_tess_factor_read(struct r600_shader_ctx *ctx,
        if (r)
                return r;
 
-       do_lds_fetch_values(ctx, temp_reg, dreg, 0xf);
+       do_lds_fetch_values(ctx, temp_reg, dreg, ((1u << nc) - 1));
        return 0;
 }
 
@@ -2941,13 +2941,13 @@ static int r600_emit_tess_factor(struct r600_shader_ctx *ctx)
                return -1;
 
        if (tessouter_idx != -1) {
-               r = r600_tess_factor_read(ctx, tessouter_idx);
+               r = r600_tess_factor_read(ctx, tessouter_idx, outer_comps);
                if (r)
                        return r;
        }
 
        if (tessinner_idx != -1) {
-               r = r600_tess_factor_read(ctx, tessinner_idx);
+               r = r600_tess_factor_read(ctx, tessinner_idx, inner_comps);
                if (r)
                        return r;
        }